I don't think they ever mentioned a schedule... just that there'll be regular updates until it was usable. They can't be "late" as they didn't set a delivery date. If I ran projects like that, I'd expect the sack.
If you also factor in that it's August and someone suggested a lot of the development happens in France (which closes for August) and it's anyone's guess as to if/when an update might happen.
MS are more secretive than the NSA. Which is a shame, as communication is the only thing that might possibly save XBM now.